Furnace-door.



A. COTTON. PATENTEI) APR. 28, 1908. 1

FURNACE DOOR.

APPLICATION FILED SEPT. 6. 1907.

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No. 885-727. A COTTON PATENTED APR, 23, 1908. FURNACE DOOR.

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AIOOTTON. FU RNAGB DOOR. APPLICATION FILED SEPT. 6; 1907.

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ALFRED COTTON, OF NEWARK, NEW JERSEY.

FURNACE-DOOR.

Specification of Letters Patent.

Patented April 28, 1908.

Original application filed March 26, 1906, Serial No. 307,982. Divided and. this application filed September 6, 1907.

Serial No. 391,587.

To all whom it may concern:

Be it known that I, ALFRED COTTON, a subject of the King of Great Britain, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Furnace-Doors,

"of which the following is a specification,

reference being had therein to the accompanying drawings, in which Figure 1 is a horizontal sectional view of a furnace; Fig. 2 a front elevation of a portion of the furnace; Fig. 3 a vertical sectional view of the fire door; Fig. 4 a vertical sectional view of the fire door on the line IV IV of Fig. 3; Fig. 5 a side elevation of the fire door; Fig. 6 a plan view of a part thereof; Fig. 7 a partial front elevation showing the up er end of the fire door.

ne of the many objects of this invention is to provide a fire door for a forced draft furnace, through which air and steam may be forced to assist combustion. The purpose of this is to provide a furnace which will efficiently burn all descriptions of solid fuel, but which will be particularly well adapted to burn bituminouscoal, and other smoky fuels with the emission of very little, or no, smoke. 7

Another object of this invention is to provide means whereby when the fire door is open for the urpose of either adding a fresh supply of fue or breaking up the fire, air will not be supplied to the fire door, but when the door is closed air under pressure will be gorrced through said fire door and over the There are many other important features of this invention, relating more particularly to the construction of the fire door, which will be more fully hereinafter described.

This application is a division of my original application filed March 26, 1906, Serial No. 307,982.

Referring to the various parts by numerals 1 designates the furnace; 2 the grate bars which may be of any desired form, and 3 the fire door.

The fire door is hollow as shown in Figs. 3 and 4 and its inner side 4 is perforated for the passage of steam and air into the fire box above the grate. Near the vertical edges of the inner plate 4 of the door and near its upper edge on its inner side isformed a depression, 5 one wall 6 of which is at an angle to the adjacent wall of the fire-door opening.

Perforations 7 are formed in this angularly disposed wall of this depression so that steam and air passing through said openings will impinge on the adjacent wall of the fire-door opening, as shown clearly in Figs. 3 and 4. The object of this is to bring said air into direct contact with a highly heated lane surface, whereby said air will be heated and the consumption of smoke and hydrocarbons assisted.

The perforations 7 a through the inner side of the fire door are arranged in horizontal rows, which extend the entire width of the door and between every other row, on the fire side of the door, is arranged an inwardly extending horizontal rib 8, as shown clearly in Figs. 3 and 4. The walls of the openings adjoining each of said ribs are inclined toward the ribs, as shown clearly in said figures; so that air passing through said openin s will impinge upon the sides of said ribs. T e object of this is to have the air heated and deflected by these ribs.

A steam pipe 9 is connected at its rear end to a suitable steam supply. I prefer to connect this pipe with a steam supply controller such as shown in my co-pendmg application Serial No. 307,982, filed March 26, 1906, but I may employ any form of device, as will be more fully hereinafter set forth. The pipe 9 is connected at its forward end to a steam jet 10 which is arranged to deliver steam into the upper end of a steam jet blower 11 which is mounted vertically in the top of the fire door 3.

In the pipe 9 just above the fire door is arranged a valve 12. On the fire door is secured a valve operating arm 13 which carries at its upper end an ad'ustable striking-pin 14. This pin is adapte to enga e the stem 15 of the valve 12, when the fire door is closed to force said valve stem inward and open the valve, thereby permitting steam to flow through pipe 9 and jet 10 into the the striking pin is moved away from the valve stem. The purpose of this is to prevent steam flowing through the et 10 when the fire door is open. When the fire door is open either to permit fresh fuel to be )laced on the fire, or to breakup the fire, va ve 12 will be closed immediately by reason of the arm 13 being swung away from said valve. This will prevent steam issuing from the 'et 10.

1 When the fire door is closed valve 12 will be at once opened through the pin 14 striking 15, and steam will issue from the jet 10 and air and steam will pass through the blower 11 into the fire door and from thence into the fire-box-above the fire. It will be readily appreciated that when said door is opened some means must be provided to prevent the steam and air flowing into it through blower 11. This is simply accomplished by making the nozzle 10 stationary, which also does away with flexible or other complicated connections between the steam-pipe and nozzle, if the nozzle were attached to the blower or door. Further, the closing of valve 12 when the door is opened, prevents the steam from blowing across the firedoor opening, which would both waste the steam and interfere with feeding coal to the fire.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A fire door for a smoke consuming furnace consisting of a shell provided with a perforated inner face plate to form a chamber Within the door which will be in communication with the fire box through the said perforated inner face plate, said plate being provided with a row of perforations near its vertical edges whose walls incline forwardly and outwardly, whereby jets passing outwardly through said perforations would travel in forwardly extending lines oblique to the vertical inner face plate of the door, a blower entering said door, a steam jet nozzle adapted to deliver steam through said blower whereby steam and air will be delivered within the chamber in the door, a valve to control the supply of steam to said nozzle, and means carried by the door and adapted to open said valve when the door is closed.

2. A door for a furnace consisting of a hollow shell closed at its outer side and provided with a vertical inner perforated face plate whereby the chamber within the door is in communication with the fire box through said perforated plate, said plate being provided near each vertical edge and near its upper substantially horizontal edge with a series of openings having forwardly and outwardly inclined walls whereby jets of steam and air passing outward through said openings will travel in lines oblique to said inner face plate, and means for delivering steam and air into the chamber within said door.

3. A door for a furnace consisting of a shell closed at its outer side and provided with a vertically arranged perforated inner face plate, the walls of said perforations being oblique to the vertical plane of said face plate whereby jets of steam and air passing outward through said openings will travel in lines oblique to the vertical plane of said plate, and means for delivering steam and air within the chamber in said door.

4. A door for a furnace comprising a hollow shell closed at its outer side, a perforated inner face plate forming the inner side thereof, a series of horizontal ribs formed on the outer side of said inner face plate and extending inward toward the fire box, the walls of said perforations in said plate being oblique to the vertical plane of the plate and directed toward the adjacent horizontal rib whereby jets passing through said perforations will impinge on said ribs and be deflected thereby, and means for supplying steam and air to said door.

5. A door for a furnace comprising a hollow shell closed at its outer side, a perforated inner face plate forming the inner side there of, a series of horizontal ribs formed on the outer side of said inner face plate and extending inward toward the fire box, the walls of said perforations in said plate being oblique to the vertical plane of the plate and directed toward the adjacent horizontal rib whereby jets passing through said perforations will impinge on said ribs and be deflected thereby, means for supplying steam and air to said door when the door is closed, and means for cutting off the supply of steam when said door is open.

6. A door for a furnace comprising a hollow shell closed at its outer side, a perforated inner face plate forming the inner side there of, the chamber within the door being in communication with the fire box through said perforated plate, the perforations near the vertical edges of the face plate being formed with walls which incline forwardly and outwardly to cause the jets passing therethrough to travel forwardly in lines oblique to the vertical plane of the plate, said plate being also formed with horizontal rows of openings and outwardly extending horizontal ribs between said rows, the walls of the perforations adjacent said ribs inclining in order to deflect the jets of steam and air towards the adjoining rib, and means for supplying steam and air to said door.

7. A fire door for a furnace comprising a shell closed at its outer side, an inner face plate to form a chamber within the door, said plate being formed with an outwardly extending depression extending around said f late near the ed es thereof, said depression In testimony whereofhereunto aflix my eing substantialy V-shaped in cross secsignature in the presence of two Witnesses 0 tion, a 1slerifes ogperforations bfiing ffirm fed1i1n this 3rd day of September 1907. one Wa o sa1 epression, t e Wa s o t e '5 perforations being perpendicular to the Wall ALFRED COTTON of the depression whereby the Walls of the Witnesses: perforations will be ob1i%ue to the vertical GEO. O. TOTTEN, plane of the perforated p ate. GEO. R. FORD. 

